Ensure ip6table_filter module on all ci nodes for libnetwork

Signed-off-by: Brian Goff <cpuguy83@gmail.com>

Jenkinsfile

@@ -180,6 +180,9 @@ pipeline {
                         // needs to be last stage that calls make.sh for the junit report to work
                         stage("Unit tests") {
                             steps {
+                                sh '''
+                                sudo modprobe ip6table_filter
+                                '''
                                 sh '''
                                 docker run --rm -t --privileged \
                                   -v "$WORKSPACE/bundles:/go/src/github.com/docker/docker/bundles" \
@@ -577,6 +580,9 @@ pipeline {
                         }
                         stage("Unit tests") {
                             steps {
+                                sh '''
+                                sudo modprobe ip6table_filter
+                                '''
                                 sh '''
                                 docker run --rm -t --privileged \
                                   -v "$WORKSPACE/bundles:/go/src/github.com/docker/docker/bundles" \
@@ -776,6 +782,9 @@ pipeline {
                         }
                         stage("Unit tests") {
                             steps {
+                                sh '''
+                                sudo modprobe ip6table_filter
+                                '''
                                 sh '''
                                 docker run --rm -t --privileged \
                                   -v "$WORKSPACE/bundles:/go/src/github.com/docker/docker/bundles" \
@@ -972,6 +981,9 @@ pipeline {
                         }
                         stage("Unit tests") {
                             steps {
+                                sh '''
+                                sudo modprobe ip6table_filter
+                                '''
                                 sh '''
                                 docker run --rm -t --privileged \
                                   -v "$WORKSPACE/bundles:/go/src/github.com/docker/docker/bundles" \